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Originally Posted by Kobuchi
That corrosion in the cap is a good thing. It's sacrificial - so the copper/brass corrodes less (e.g. stays shinier) than without the aluminum anode. This is a selling point. We do the same for vehicles and steel structures, why not waterblocks. Give it a copper wire tail to hang in the coolant.
Aluminum does pit when it corrodes. So chunks can fall off.
Still, I think people might buy these as expendable anti-corrosion anode plugs. Replace every 6 months...
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if you wanted a sacrificial metal, just stick zinc in your system. and i don't think comparing the use of sacrifical metals, in oxygen rich environments applies to water cooling. where the whole point of sacrifical metals, is that they are more reactive to oxygen, and therefore stop the steel from rusting.
Aluminum is a poor sacrifical metal, because its expensive, and also a aluminium oxide layer protects the rest of the aluminium form oxidisation. thatis until a bit falls off, in the case of a water cooling system.